openFrameworks实现的简单版可360度移动的贪吃蛇游戏-Snake

#include "SnakeSeven.h" float distSnakeSeven(ofPoint aPosA, ofPoint aPosB) { return ofDist(aPosA.x, aPosA.y, aPosB.x, aPosB.y); } void SnakeSeven::setup() { nDia = 20; nVel = 4; nStep = 2; float nAngle = ofRandom(0, TWO_PI); ofPoint pStartDir = ofPoint(cos(nAngle),sin(nAngle)); ofPoint pStartPos = ofPoint(ofRandom(0, ofGetWidth()), ofRandom(0, ofGetHeight())); pBodyPosArr.push_back(pStartPos); float nStartAngle = atan2(pStartDir.y, pStartDir.x) * RAD_TO_DEG; nBodyAngleArr.push_back(nStartAngle); for (int i = 0; i < nDia / nStep; i++) { ofPoint pPosTemp = pStartPos - pStartDir * nStep * i; pPathPosArr.push_back(pPosTemp); nPathAngleArr.push_back(nStartAngle); } ofPoint pEndBodyPos = pPathPosArr[pPathPosArr.size() - 1]; pBodyPosArr.push_back(pEndBodyPos); float nEndBodyAngle = nPathAngleArr[nPathAngleArr.size() - 1]; nBodyAngleArr.push_back(nEndBodyAngle); } void SnakeSeven::update() { ofPoint pMouseXY = ofPoint(ofGetMouseX(), ofGetMouseY()); ofPoint pNewDir = pMouseXY - pBodyPosArr[0]; pNewDir.normalize(); ofPoint pNewPos = pPathPosArr[0] + pNewDir * nVel; float nDist = distSnakeSeven(pNewPos, pPathPosArr[0]); int nNums = nDist / nStep; float nNewAngle = atan2(pNewDir.y, pNewDir.x) * RAD_TO_DEG; ofPoint pNewPathPos; for (int i = 0; i < nNums;i++) { pNewPathPos = pPathPosArr[0] + pNewDir * nStep; pPathPosArr.insert(pPathPosArr.begin(), pNewPathPos); nPathAngleArr.insert(nPathAngleArr.begin(), nNewAngle); } int nIndex = 0; pBodyPosArr[0] = pPathPosArr[0]; nBodyAngleArr[0] = nPathAngleArr[0]; for (int i = 1; i < pBodyPosArr.size(); i++) { nIndex = i * nDia / nStep - 1; if (nIndex < pPathPosArr.size()) { pBodyPosArr[i] = pPathPosArr[nIndex]; nBodyAngleArr[i] = nPathAngleArr[nIndex]; } } for (int i = 0; i < nNums; i++) { pPathPosArr.pop_back(); nPathAngleArr.pop_back(); } } void SnakeSeven::draw() { ofPushStyle(); ofSetColor(255, 0, 0); ofPushMatrix(); ofTranslate(pBodyPosArr[0]); ofRotate(nBodyAngleArr[0]); ofRect(- ofPoint(nDia, nDia)/2, nDia, nDia); ofPopMatrix(); for (int i = 1; i < pBodyPosArr.size(); i++) { if (i % 2) ofSetColor(120, 60, 80); else ofSetColor(220, 60, 80); ofPushMatrix(); ofTranslate(pBodyPosArr[i]); ofRotate(nBodyAngleArr[i]); ofRect(- ofPoint(nDia, nDia) / 2, nDia, nDia); ofPopMatrix(); } ofPopStyle(); ofDrawBitmapStringHighlight("Ve: "+ofToString(nVel), ofPoint(50, 100)); ofDrawBitmapStringHighlight("Dia: " + ofToString(nDia),ofPoint(50, 120)); ofDrawBitmapStringHighlight("length: " + ofToString(pPathPosArr.size()/ (nDia / nStep)), ofPoint(50, 140)); ofDrawBitmapStringHighlight("Press 1 to lengthen.", ofPoint(50, 200)); ofDrawBitmapStringHighlight("Press 3 to accelerate.", ofPoint(50, 220)); ofDrawBitmapStringHighlight("Press 4 to slow down.", ofPoint(50, 240)); } void SnakeSeven::keyPressed(int key) { if ('1' == key) { addBody(); } else if ('3' == key) { nVel++; } else if ('4' == key) { nVel--; } } void SnakeSeven::addBody() { ofPoint pNewBodyDir = pBodyPosArr[pBodyPosArr.size() - 2] - pBodyPosArr[pBodyPosArr.size() - 1]; pNewBodyDir.normalize(); ofPoint pEndBodyPos = pBodyPosArr[pBodyPosArr.size() - 1]; float nNewAngle = atan2(pNewBodyDir.y, pNewBodyDir.x) * RAD_TO_DEG; ofPoint pPosTemp; for (int i = 0; i < nDia / nStep; i++) { pPosTemp = pEndBodyPos - pNewBodyDir * nStep * i; pPathPosArr.push_back(pPosTemp); nPathAngleArr.push_back(nNewAngle); } pBodyPosArr.push_back(pPathPosArr[pPathPosArr.size() - 1]); nBodyAngleArr.push_back(nPathAngleArr[nPathAngleArr.size() - 1]); }